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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '927d87d4c0c1a7d4cea5c0a31c33cf52ac70e1c58ad36f53ba2c55459adfea71' 
  AND token = 'vrck05nfKq08ehsPwJ8JAFLl+l7n2/nA652FrZbxyNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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