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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9141eef7c8c25c94f60972bf2fa535066f14da9f8cef5e80a909da58c3e0a0e4' 
  AND token = 'AHilC4rTwkx7cm8TWdFl8z2c5JejXmIRgFlNO7n40q0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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