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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfd18593ae42809c072a70c175e3fca5845c1a6df073baa818b9805b0f1d6220' 
  AND token = 'eDcbbenB5v15psZzxad3IqVrGEDS/2eAU5rsxq+AvXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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