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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a9bb1c5d35b878a2f841dfb8a623aaf5d8f3413ec1f001c58b31f65413b2878' 
  AND token = 'cgRmjpf0NltOTuta3SI9BvC4Kvcdjc6a5uwCckxkHl0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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