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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a755d0c5a63331e6330b2aa5e9ea7f6e8ad8b114f87fd609c795ad663191234e' 
  AND token = 'i/pmqSI5tAGFptAVCBERnFF+u/cEK/WztEuCygk32C8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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