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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25fb2babc78714a606aed83ccc25e1a0a0985a96eefcad7ec4d7a4c14b6aa4c6' 
  AND token = 'X72c2Rs4M0x8HLDbjHPc6H0wTaKmIEAQj+m3u/OhrCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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