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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4ed013a47afe186f074e741d2ec9b40f9bd7e7354707fe337e07aefa578bb31' 
  AND token = '6JzJS4imzMRWeeKPYq4M3h+Wz6vendHK6z2U6Lf66fw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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