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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '447392eff5f3e2949c4f9092a074edceae00db45b38ea395a8068565ce3a3853' 
  AND token = '0QTPasmSLNoEGdY+c2P3/86TN1nxq5rEqViQ4DwzR10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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