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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6aacbdb72b2dcaca7b891aaa759ce6a4cc7af52eb074cbf1ccd21854c000e3e4' 
  AND token = 'SAMRX/SG71qH1XcPFkyKyeFP0D+rZUo3VJ2AyWJutT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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