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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03e52de6dc5e321b8d679b89fca0dc002c522c4d1265209f9209eeeb0a54a918' 
  AND token = 'h3VZC+zSsDdsKGSrTqDYchuQSJ37k13l8uvCCEaAaNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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