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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05d2a78685f0f0d0a0f2eb5c78cde00df66b8e731c80d0c20b0d01efe8567a8a' 
  AND token = 'L5b1bDFms8nGY6qfNsdDEP7xl+B2fNsd3T1w/0TK3zE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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