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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c06ba0c49de69c47e5a6a7cb18bd6d270ba25049edd0f32cbfe6ea861c78389a' 
  AND token = 'cvwbogyyBD8sM3Ln21Cfh/6oTC47sSrZMiDQGY2qI0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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