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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a00fce05cc934548524a4db8c0a1fe5a306d90368417391c732fa6dcc2e5c04b' 
  AND token = 'R5QqTUphqTcomdu8SpzC8An8aQN8nsh1Z0AQ8JG3oa0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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