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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c64b2caa5bbe7d1f06bca5c342a23af99eb9609d32c093853603f4666617efef' 
  AND token = 'K2oghr8P5iQRcJ0nsAXPqO3cb/10WuMACOpT3Gud2ik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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