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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79eb250fd07a2283c53f7a20ac10cd130c7719f5df6d03c5355c15907ce9374e' 
  AND token = 'Qd3qkoX0f2lGriTCi0WXR7w0E241IE354A31cHdf93g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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