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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be1b3a89e9cea41eb18f0092595a6eea30ae85f78d92cd773e9cf0e53eb2904d' 
  AND token = '66LRK1dIexN/cbyHiBnZyTmSBJYShF5w9LDSkRNWgW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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