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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5eba086e6a11b637b002c92999d9deb2b5c6a5a7911c2de4d8e186662b39fa0' 
  AND token = '5/vKBReBcPC3BWTUevjS+VPPKYiWerEaqscjaOQu9qU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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