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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc70a60067c2d8413d3d22df89cd5e908f2c1f3a2e99595fbdd4b1adef2247d0' 
  AND token = 'ybRb2CIQx8zdeG5zURJO1PiGyoDimau+dnldG1u5DPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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