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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '439ac23a4a5db6e65de7e484e18740d4646acee0a1a82d23cb070326fdd16a47' 
  AND token = 'kGacDIuM9Fra/QN4JVGQ9zxP6XX73e3DRlbW4bRr3pE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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