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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0af2e8ecde977e8c3d4d17f5f1262521b4755843e8d74f2aa08dc47369095fd1' 
  AND token = 'brxYQ2hbVtfgdJ1awEK6X09ogMlB1+9g62e6mU90Fe8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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