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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b54017dd826f1adec241d3f3d3b7319203c5568497443c9087b91ae94861257' 
  AND token = 'c+PTxePJ0gu2xe3a/cqAQKs3dzycc4lpF6f0Jb2Yq5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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