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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f437a0c2c636c515136b5b2eea5e897febb42cd1a8443b34f934698bc5fe3c79' 
  AND token = '08DM8YEoZv3KUKxhXi8rFbaZ6lAFcu06D5B+mqfMwo4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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