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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9b6b2ac96036a3a5e7640760da4a07d4ee9f2142a79d0d2c7ef99af8b8ccf69' 
  AND token = '0WWlv/fkwVdxudwZ3EgeNNVH0+z9I3fG+aUDuiqpyhU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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