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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '509832dcf14ee0f82007ab6dbde1967ddfba433f7102b4a03ee8529050ba90e1' 
  AND token = 'ojN/ZF8hhRKPIQVdGvICDXeb0qLwLP1N98tZ8fsfg+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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