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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40ed9706c5a3763ffb0f5b7b088a93e0d6555bdb00ce5fe4470b51f9358903c5' 
  AND token = 'A5YQPltkpxpgrhHK9y5ytHS/FL04ueERLXNPMwZACpk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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