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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '901dbe6c077cfbf55bc19dad9f1a927e4e8db95899283dbe0fb1f0979bbf716c' 
  AND token = 'lFUreZ0S76k6zmNfY2fyN6kGAp6UTZht/10fN7JV34c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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