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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76a37ac7208576fb707ccbbb1ba36b9ade1f4187b570204c0ebb8a71e7fa34e6' 
  AND token = 'tR2fzDuAtVhB2R0PlUI90xzobmAlCCX2huGjJfo3oJ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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