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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cabab3b3d4183dd56c730a31880e286e18ae57004c7fcfcacee4fad2ba1f6e1b' 
  AND token = '6E065o8V6KAxa0W3SY6G+yhjUfEPfIyJkl28siClqT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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