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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '092b4a22de69f5b5c67bfa9ded0500fc30afe788464db3279afc52eded7faec2' 
  AND token = 'zbyuEU6rAhuY8fIn3l43aEIPvPAo6j1Qm1XuMkGlKNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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