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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b524050071a75bc9baa43d0db5ce059711509e7acb6a682957e22703a2bbf156' 
  AND token = 'AJZVC4Kea/CdAx4vH+aq4h/LT3w5Cnu33xyWjE3iWVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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