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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b46c619df2e8ff46ec6cb082d769cb4cd1a6cae05eee8778c39682eec4d791ba' 
  AND token = 'YrJep1U8a2gv46gVSJN8h6JBzoxU3aSCnBX8NNoJ+iA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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