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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5b91f56eeb787f379b8aaabddcdd07b01eeab15b83a13c0f66365591f3516bf' 
  AND token = 'yUcmSxy0Y9igE0w/HdOIrFPczyWkFDPFrtyDBYD9/ds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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