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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19fcee9c87ebaf31d4032a36831f4e14f0dc0cc1e84554f2f869c73addbf106a' 
  AND token = 'r3/MGJGXN7QNvFfRfEHXP2UcoyyJGGtb6pt/3xnxu5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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