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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ba1889f1f6a503d9853b9978675b8f20fae3516d3c798473ab8c2da9fce0e3d' 
  AND token = 'oH+9PwHmfyb6CtJMMpbsPUlgw3Lx+rQ2m1HSLmJsUwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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