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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd96e490c5efadb203e5b460219f0d7c7f998fe35856d7d4623fabacccc83d07' 
  AND token = 'DS9v1MbxgOj541/f/bwey+AO3K9H5QMDpLZwGBh26EQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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