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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40296ba5e173281f87bd207982098a5f8f319804e1df6079ae33d7e731c6df2b' 
  AND token = 'YXI4OUbbcRRclYNmXLnqTwe3epuD594UsswIpomLQeY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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