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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c98c7e628663a7c0797d6abda32ce398c9c6fdf7c22d9d94758258125c3849cb' 
  AND token = 'NdJ2kJ4o7StPT+dwd8RgegXac4m44A2HCLOcF6PIX8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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