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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c9880a1ec0a90c2df7a9d2e40ac1e8ce2804c778455f49345574e8ee8e64ad9' 
  AND token = '+YWY8/8RWiXY1MLTkGRVMIy2lEflmbyWnt6HyGzLKYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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