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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f190b0f5c6471aaf7590a25b29357609f0f3b0470f63ba6d9d1e911777115b06' 
  AND token = 'aeKsp+R0k0Cn1sXB/b+IdyEsvmD1WwwuXOQV473kbuY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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