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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '020aa108b24ca129650ecebd43ef97f76bf90bc6b2cf40b0edcb3acf646694a3' 
  AND token = 'yFDPGUNK7zPDNtk+gLueXDMRbrL7UURi8twN+4wJXgw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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