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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7508a9ae8e2235315d98b19c4c2d848752fa61f1b2a587a8966f0ffc8739f111' 
  AND token = 'MJCLPbrqXNHHoM3JebgB0F28dAFC6rv23Gkv2Uw+WD0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}