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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a0b42757737fb10208419b0768abdffce2dc76e213e9a51161f376a5beff635' 
  AND token = '1U7gg6fsaBrWqDIaXx7L1xauQ0PkBa91vW/RwAnNOGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00135

JSON explain

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