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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e00827b6620854ec395dde8266876581ec5263d72c37edfc7c5dce25e0ed0ff3' 
  AND token = 'WClCJRIOsw7FRaH/9drdv2caV8ifKVhUV4y9c9wY/bM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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