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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28fdd8ed44b700e11ffce86f305c7ae9a094879ebefef3ecbdf0df297607f5d8' 
  AND token = 'p0ICWYs6jasGFIc/fuSNFVh4HjZibDsvu1klJIsgHlU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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