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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c1a8bcf81f4991b55d1be010e11f8548bfb619724a27b0e55bdb7b765ba41f1' 
  AND token = '4h9d5y2m95Gr5CKZQwUtoVkk6xsert2LGewUSbEqxOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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