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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '329d29b5e20ac000d1f17533fa1c1188bf811368fcfe57dda5bd2530507b72a2' 
  AND token = 'KNNPoq4yNexlEXSzjziu2SoLjCv0a+yzSvaqisNPj2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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