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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82cd3331baf1dcda32a7ec989ef0b467d8cb507be34f309839d5b4b63df763c2' 
  AND token = 'Z0sTvE0j3AzsudCqx6Z71BZwSKaSn2OYsfl2Km+hbQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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