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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66fbff4743bdd9810dd79526c6fdaf907f4845ea369c17aebcce021520cf9c5b' 
  AND token = 'Bh0W4HF/ned589bex78ZytsKewSs2b274dM0mBthLj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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