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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76566cf37d2d66b5dfb13ccc2bbd297cacff0ee900c50474d9850d95dbef9a1b' 
  AND token = 'HM8N2ahyNCurJICd1/eIgvjNts4ZsF3i38/hSr7bY4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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