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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f69c7959ce574a315f0bc8eaa656bae5197a6a77aa74346c263dcda8ce241aa3' 
  AND token = 'zgCvrhgL365g01k1ZXbtcrPCcVrViatIdQbWbT3P5VA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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