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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f07638cf7318a233786ad1261cdacd2d0d329a5e4df9838a4ed11d02c13f47ad' 
  AND token = 'SVsEuOyN5YrmapVnIQ8OPTK3p8VHrmqx5jzqa76vHDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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