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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93d0ab021f9da4ce8a65df6447e1a009ae31df0928e45014a617128e1df46a6f' 
  AND token = 'thFm8zo5LnJtBW/wwtbGEBpv5Jvw4UeRHTB2Pqumdoo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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