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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2176a2b682a870ab5e4136bc4ec81f702d376e888f604b3ebf0c2bb3e07c3f8' 
  AND token = 'ni/pjyT7HjTkyf8nWrsvd2JAuc8xMpyEMLhmb24Pwwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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