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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2af46472898d1475f873a2d513036b37cf2f7886659cd200ec9e33eecdee3ca' 
  AND token = 'Bj56xd/mlMUP1bmz++Q6+cqSWogGSsJv227cJM6VMsc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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