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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4cf11dd26aa92db4894faeb9abc13a7120a7098cbd90d170d2932ccaf4d87ad' 
  AND token = 'eOQcLqo0QSn53E6EcJCEli9JyzdVm4GepHaVbWZ7XUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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