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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6f81cfc0d716cd4de49b00080205803e5867ec9a2a8e487031cd80f77b8518b' 
  AND token = 'SyPHKMd/L8R0ZMax2clwkh2Egj/V5dFpFgI03oJajSI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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