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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a337c647969e2c195874923d4c761274d66795a7d66470dbacbb983a99fa8ec3' 
  AND token = 'S7ybMKNKhoP06n/EktyjhjKIDm8WUsvmq4rHyiVOQRw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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