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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13207d378282f5229ebb9a63cbe090c32081d53b9415b9f1a19cfacad3e3c4ae' 
  AND token = '3uQ1llmNJUrC2GCKblBsbjdivuPP7eMZT7Nu53ugeMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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