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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a870be26be61444ac1509ea94491172a9be6b9e5e6634a5e1da29ef80239e47' 
  AND token = 'WmT0FT0joU7Qf3Fpy/PsVuvIcD4mbrUVtgfd0y9uT4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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