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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78d079805bf0cfd8f4b624af2ae4dceccc51be201f44b2354beb714382643c4d' 
  AND token = 'R5bOD1FoiBYwPisPuSMm2wBQMx6O5/X9teHP8NLqWQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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