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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84b0b6e80d44e7307a5d058c4ac921aac56959dd8a6cf296265af4e3c39f3e3f' 
  AND token = 'VPVLBidrspBRWxRLywEI1y60cMy4SfR8MHVBmUuS0KY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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