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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90500616ae8d2eedfe265e785ff3dc3dd425cc06ba2c5428a6d0aa8425f4b263' 
  AND token = 'HGJxeC7tdjtX8et6MDMT3YVOqYu+rN6QOfMEfErzW44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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