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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcecaaf8e35914c9e19ce1b1216208d853e0eb90283cc52912b1c9231ba04916' 
  AND token = 'MZMxts3KpxUJA9WJ0cfXNhlIb/EXZsi3Ijfxdr0x3Aw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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